They are 10:1 on a stock 22R? so that would make them like 12:1 with the 20R head?
stock 20 is 8.4 or stock early 22 is 9.1 like kyle said, but when you shave the 20 head like mine is and put it on the 22 you can get 9.5 :1 or 9.7
to gett more you need some popup pistons, from like downey or LCeng
up to 12;1
